Subregions of Las Vegas Valley
Till now Las Vegas Valley has
2 played regions below it. Following direct parts of Las Vegas Valley have been played until now:
Neither Ruled nor Mapped Subregions till now: Enterprise.
Sibling Regions of Las Vegas Valley
Played regions on same layer like Las Vegas Valley up to now:
Neither Ruled nor Mapped Sibling Regions till now: Boulder City,
Enterprise,
Goodsprings,
Mesquite,
Moapa,
Moapa Valley,
Mount Charleston,
North Las Vegas,
Primm,
Searchlight,
Spring Valley,
Summerlin South,
Sunrise Manor,
Whitney,
Winchester.
Badge(r)s! 
(Only makes a difference if you play the game. Otherwise never mind.)
Las Vegas Valley
Henderson 
Las Vegas 
Paradise